Role: Guy ThompsonGuy is a high-powered security consultant whose public lectures have made him somewhat of a celebrity. Behind his own closed doors, he is a control freak and a wife-beater. Guy comes from a broken family. His father had an affair and an illegitimate son and his mother was an alcoholic. He comes under suspicion when Havers finds a witness who saw a red-haired woman asking the missing girl for directions. When the mysterious redhead turns up in the emergency room, a victim of domestic abuse, Guy turns out to be her husband.

Plot: The body of a schoolgirl is discovered in a secluded lake. An autopsy reveals that she had committed suicide to escape captivity. Lynley and Havers try to find a second missing girl before she meets a similar fate. The police focus on Guy Thompson who had only recently beaten his wife, Tanya. Havers works on gaining the wife’s trust while Lynley learns more about Guy’s troubled background. As they continue the investigaton, there is a growing doubt as to just who is the most dangerous.

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Trivia & Facts:- Know Thine Enemy was based on the true chilling Paul Bernardo-Homolka case in Canada.- It was the very last Inspector Lynley episode to be aired.

Film Location: London, Brighton (England)

Quotes:Nathaniel Parker: I think Lynley has been going well. We are stupidly rushed this episode. For a bunch of reasons our script wasn’t ready on time and we cast very late. So late in fact that we didn’t even get a read through. Once before I didn’t get a read through and then I discover how important they are. We have James D’Arcy and Honeysuckle Weeks with us in this episode. It’s a very different kind of episode. Can’t tell you in what way, but it’s just not the usual.It deals with the investigation in a very different way. It begins as a whodunit but quickly becomes a why- and which-one-dunit. It’s more psychological than previous episodes, & it takes longer to get inside the heads of the characters. It’s also a much smaller cast, because we haven’t got a lot of possible suspects and there are no real red herrings. It’s more a race against time. I don’t think that if we had carried on with the series we could have done many more like it, but this one works very well indeed. James D’Arcy and Honeysuckle Weeks were fabulous to work with.

Reviews:The best thing about the final episode is the casting of James D’Arcy and Honeysuckle Weeks as an upwardly mobile couple with dark secrets and a possible involvement in the murder of one teenage girl and the disappearance of a second --– San Francisco Chronicle, David Wiegand